{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{3}{c}}
\toprule
                    &\multicolumn{1}{c}{Large}&\multicolumn{1}{c}{Small}&\multicolumn{1}{c}{All}\\\cmidrule(lr){2-2}\cmidrule(lr){3-3}\cmidrule(lr){4-4}
                    &\multicolumn{1}{c}{(1)}   &\multicolumn{1}{c}{(2)}   &\multicolumn{1}{c}{(3)}   \\
\midrule 
Post $\times$ Treat &       0.276***&       0.169***&       0.170***\\
                    &     (0.028)   &     (0.035)   &     (0.035)   \\
\midrule
Control, Pre Mean   &        0.84   &        0.97   &        0.97   \\
\midrule R2         &        0.37   &        0.27   &        0.27   \\
N (millions)        &        1.36   &       66.94   &       68.29   \\
\bottomrule
\end{tabular}
}
